Keystones — Lintel
Five GCSE retrieval questions · 15 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00088 in standard form
Answer: 8.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 22.21cm -
4. Ratio Mixed ratio problems
£252.00 is shared between A and B in the ratio 5:2. How much does A receive?
Answer: £180.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 31, 24, 18, 48, what is the missing number?
Answer: 24